std::make_error_condition(std::errc) - cppreference.com

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std::errc

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Defined in header `<system_error>`
std::error_condition make_error_condition( std::errc e ) noexcept;		(since C++11)

Creates an error condition for an errc value e. Sets the error value to int(e) and error category to std::generic_category.

Parameters

standard error value

Return value

Error condition for e.

Example

Run this code

#include <iostream>
#include <string>
#include <system_error>

int main()
{
    auto err = std::make_error_condition(std::errc::invalid_argument);
    std::cout << err.message() << '\n';
}

Possible output:

Invalid argument